Fluid operated pump with separate, aligned pump and engine valve units



May 15, 1962 c. J. coBERLY ETAL 3,034,442

FLUID OPERATED PUMP WITH SEPARATE, ALIGNED PUMP AND ENGINE VALVE UNITS 4 Sheets-Sheet 1 Filed Aug. 9, 1960 Juve/Noes. 2,42EM6E Cl.' been 17,44 .Kow

May 15, 1962 c. J. coBERLY ET AL FLUID OPERATED PUMP WITH SEPARATE, ALIGNED PUMP AND ENGINE VALVE UNITS 4 Sheets-Sheet 2 Filed Aug. 9. 1960 a W M s. w i e //...l`v4 if! L1 Vl: m KE ,5 me m m n@ N C c u C s E .a M( Q O d d@ M O M my M m A E f 15.0 L H M K mv das.. E ,M m l n ,n E, 6 w 76 W E n A E \\\/,0 MMW/ kw /7 R /M y Q I /v /fV- L/ 3 E J/ /6 /0 /aa 9 a M 5 n May 15, 1952 c. J. coBERLY ETAL 3,034,442

FLUID OPERATED PUMP WITH SEPARATE, ALIGNED PUMP AND ENGINE VALVE UNITS Filed Aug. 9. 1960 4 Sheets-Sheet 3 7S Ll \l\l|\! j c, w E 5 J A A Ai C 0 DA p m /\}\\/L May 15, 1952 c. J. COBERLY ETAL 3,034,442

FLUID OPERATED PUMP WITH SEPARATE, ALIGNED PUMP AND ENGINE VALVE UNITS Filed Aug. 9. 1960 4 Sheets-Sheet 4 {WEA/m25'. lge/VCE C. 08534. 274/., Koax/7;

United States Patent Office 3,034,442 Patented May 15, 1962 FLUE) QPERATED PUMP WITH SEPARATE,

ALGNED PUMP AND ENGINE VALVE UNITS i Clarence J. Coherly, San Marino, and Val Kognt, Compton, Calif., assignors to Kobe, Inc., Huntington Park, Calif., a corporation of California Filed Aug. 9, 1960, Ser. No. 48,541 11 Claims. (Cl. 10S- 46) The present invention relates in general to iluid operated well pumps and, more particularly, to a fluid operated well pump and pumping system of the type w ich includes separate pump and engine ,valve units and in which the engine valve unit is installable in and removable from the well independently of the pump unit, a iiuid operated pump and pumping system. of this type being disclosed and .claimed in co-pending patent application Serial No. 598,785, led July 19, 1956 in the name of Clmenoe 5. Coberly, now Patent No. 2,949,357, issued August 23, 1960, the disclosure of which is incorporated herein .by reference.

The aforementioned patent discloses a uid operated pumping system incorporating separate pump and engine valve units wherein these units are located side-by-side in the well when in their operating positions and are installable in and removable from the well independently through pump and valve tubings, preferably by circulating them into or out of the well hydraulically. This arrangement, of course, requires that the pump and valve tubings be set in the well in side-by-side relation.

A primary object of the present invention is to provide a tluid operated pumping system utilizing separate pump and engine valve units wherein these units are located in axial, i.e., vertical, alignment so that a concentric tubing system, rather than a parallel, i.e., side-by-side, tubing system, may be employed. Thus, the present invention permits the utilization of separate pump and engine valve units in a well bore which is too small to accept a parallel tubing system, or wherever it is desired to utilize a concentric tubing system for any reason, which is an important feature.

An important object of the invention is to provide a pumping system wherein the engine valve unit, when in its operating position, is located above, and invaxial alignment with, the pump unit, and wherein the engine valve unit is installable and removable independently of the pump unit.

Another important object of the invention is to provide a pumping system wherein the independently installable and removable engine valve unit is movable between the surface and its operating position in the well through a valve tubing which forms the innermost tubing of a concentric tubing system, the engine valve unit preferably being movable through the valve tubing hydraulically, although it may also be raised and lowered on a Wire line, for example.

Another object is to provide a pumping system of the foregoing nature wherein the pump unit is a set unit, as opposed to a free unit, located within a bottom hole housing at the lower end of an outer tubing which encircles the valve tubing, the valve tubing serving as a supply tubing for conveying operating uid, such as clean crude oil, under pressure downwardly to the pump and engine valve units, and the outer tubing serw'ng as a production tubing for well iluid pumped by the pump unit and as a return tubing for spent operating Huid.

With the foregoing construction, the engine valve unit may be removed quickly and easily for service or repair whenever required, and may be just as quickly reinstalled, or replaced with another engine valve unit, all without disturbing the pump unit itself. This is .an extremely important feature since it requires a minimum of down time for removal and reinstallation, or removal and replacement, of the component of the uid operated pump v/hich most frequently requires service, repair, or replacement, such component, of course, being the engine valve unit. The pump unit, on the other hand, requires service, repair, or replacement, much less frequently.

Another obieet of the invention is to provide a bottom hole housing which is connected to the lower end of, and in eect forms a downward continuation of, the outer tubing, the pump unit being lowerable into its operating position in the bottom hole housing through the outer tubing, which tubing is therefore sometimes referred to erein as the pump tubing.

A further object of the invention is to provide a pumping system wherein the pump unit is connected to the lower end of the valve tubing and is lowerable through the pump tubing into its operating position in the bottom hole housing by means of the valve tubing as sections are added to the valve tubing at the surface. Of course,

the pump unit may be removed from the well -by reversing this process.

Still another object is to connect the pump unit to the lower end of the valve tubing through a valve housing which provides a valve chamber for receiving the engine valve unit when the latter is circulated downwardly through the valve tubing into its operating position in the well.

Yet another object of the invention is to provide a pumping system wherein the necessary passages for interconnecting the engine valve unit and the pump unit are formed in the bottom hole housing.

The foregoing objects, advantages, features and results of the present invention, together with various other objects, advantages, features and results thereof which will be evident to those skilled in the fluid operated pump art in the light of this disclosure, may be achieved with the exemplary embodiment of the invention described in detail hereinafter and illustrated in the accompanying drawings, in which:

FIGS. l and 2 are semidiagrammatic views illustrating a uid operated pumping system which embodies the invention and respectively showing two different sets of operating positions for certain components of a duid opy erated pump of the invention;

FIG. 3 is a vertical sectional view of the upper end of an actual physical embodiment of a fluid operated pump and pumping system of the invention;

FIG. 4 is a downward continuation of FIG. 3;

FIG. 5 is a downward continuation of FIG. 4;

FIG. 6 is a downward continuation of FIG. 5;

FIG. 7 is a horizontal sectional view taken along the arrowed line 7-7 of FIG. 3;

FIG. 8 is a fragmentary, developed elevational view, taken as indicated by the arrowed line 8 8 of FlG. 7, and corresponds to FIG. 3;

. FIG. 9 is a downward continuation of FIG. 8 and corresponds to FIG. 4; and

FIG. l0 is a fragmentary downward continuation of FIG. 9, portions having been removed to reduce the width of the ligure, and corresponds to FG. 5 of the drawings.

Initially, the invention will be considered herein in connection with the semidiagrammatic Views of FIGS. l and 2. However, the description of the semidiagrammatically-illustrated embodiment of FIGS; l and 2 will be equally applicable to the actual physical embodiment 1 the axial passage 52 through the plunger 58 communicates with an outlet 62 in the pump body 36, reverse fiow well bore, notr shown, from a well head, not shown, in the conventional manner. As will become apparent, the valve tubing 22 serves as a supply tubing for conveying operating uid under pressure downwardly in the well from the surface, while the pump tubing 2t) serves to con 5 vey production uid from the well Vand spent operating uid' upwardly to the surface. Thus, the pumpV tubing 20serves as a combined production tubing and return` tubing` for spent operating fluid in the particular construction illustrated, it beingunderstood, however, that the production uid' and the spent operating uid may be conveyed to the surface through separate production and return tubings concentrically related to the supply tubingrrZZ, as disclosed in Patent No. 2,589,669, to Clarence JLCoberly, issued March 1,8, 1952.

Connected to the lower end of and forming a downward extension of the pump tubing 29 is a tubularY bottom hole housing 24 having at itsl lowerend an'annular"` seat 26 for the lower lend of a fluid operated pump unit ,Y 28; interconnecting the upper end of the pump unit'28 20 and the lower end of the valve tubing 22, and disposed within the bottom hole housing 24, is a valve housing 30 fora uid operated engine valve unit 32 which controls the operationof the pump unit. As Vwill be apparent,Y the pump unit 28 and the valve housing 30 may be low- 25 ered intov the bottom hole housing 24, and the lower end of-the pump unit seated on the annular seat' 26, by means of the valve tubing 22. The pump unit 28 and the valve housing 30 may also be removed from the well by means of the valve tubing 22. The engine valve unit 32 is 30 adapted to be circulated into and out of the-well ythrough the valve tubing 22 hydraulically as will be described inmore detail hereinafter, the lower end of the engine valve unit being seated on an annular seat 34 at the upperY end'V ofthe pump unit 28 when the engine valve unit is in its 35 operating position the valve housing 30.

The fluid operated pump unit 28 is virtually identical to that'illustrated in FIGS. 5, 6 and l5'to 2V of Patent YVthrough with-a central axial'passage 52 for production Y fluid to be pumped. The passage 52 communicates at its lower end with a welluid inlet V54 inthe pump body 36, the inlet 54, in turn, communicating Vwitlra wellr'uid 50 i Ainlet 56Vin the bottom holehousing V24.' Reverse iiow through fthe inlet `54 is prevented'by a standingrvalve 58.

. VReverse ilow through the-passager52 duringrth'e upward,

working stroke'of the plunger 38 is prevented by Va working valve'60 carried by the Vplunger'. The upper end of 55 throughthis outletbeing prevented by an upper standing valve 64. The outlet 62 Vis connected Yin duid communicationvwith the pump tubing-20V above the bottom hole 60 housing 24 by a production uid passage means inthe bottom hole housing. Y Y v As will'be apparent, during the upward; working-stroke of the plunger38, the'working valve 60 isclosed andV the plungerV displaces production uid upwardly past-,the 65 upper standing valve 64 through the production fluid passage means 66 into the pump tubing 29. At the same time, the plungerv 38T draws in additional iluid from the` well'past-the lowerrstanding valve 58. DuringY the down-Y wardor returnstroke of the plunger 38, the standing V70 valves 58 'and 64 are closed and the Working valve 60'fis open so that wellfluid is merely. transferred from below the Vplunger through the axial passage 52 into the upper cylinder 44 above the plunger.,

Considering the manner in which the plunger 385isi75 reciprocated to produce its working and return strokes, the annular area at the lower end of the upper plunger element 40 is constantly exposed to the operating uid pressure in the valve tubing 22 through an operating fluid passage means 63 formed in the bottom hole housing 24 and connectingl the lower end of the upper cylinder 44 to the interior ofthe valve housing 39 ,above the engine valve unit 32. As will be descirbed hereinafter, the annular area at the upper end of the lower plunger element l42 is alternately exposed to the operating fluid pressure and to the pressure of the production fluid and the spent operating fluid in the pump tubing 20 through a passage means 70 in the bottom hole housing 24. The passage means 70 communicates at its lower endwith the upper end of the lower cylinder 46 and communicates at its upper lend with the engine valve unit 32, which'alternately connects the passage means 70 to the valve tubingZZ and the pump tubingrZtl in a manner to be described.l As explained in Patent No. 2,949,857, the annular area at the'upperV end ofthelower plunger element 42 exceeds the annular area at the lower end of the upper plunger element 4). Consequently, the plunger 38 moves downwardly through its return stroke when the slightlylarger annular area at the upper end of the lower plunger element 42 is exposed to the operating uid pressure in the valve tubing 22. Of course, the plunger 38 moves upwardly through its Working stroke when the upper end of the lower plunger element 42 is connected to the pump tubing 20.

The engine valve Aunit 32, and its relation to the pump unit28, are also substantially as illustrated in FiGS. 5, 6

andV l5 to 32 ofPatent No. 2,949,857, andas described v .sage means 70 leading to the upper end of the lower cylinder 46 and a branch passage means 78 which communicates with a passage means leading to the pump tubing Y 20, the passage means 80 being formed in the bottom hole housing 24 and Vthe branch passage means 7S being formed Y in the bottom hole housing, the'valve housing 3i) and theV valve body 72. Under these conditions, the pressure in the pump tubing 20,is applied tothe upper end of the lower plunger element-42 and .since the operating tluid pressure in the'valvertubing22 is always applied to the lower end of the upper plunger element 40 through the operating fluid passage meansV 63, the plunger 38 moves upwardly through its working stroke, as indicated by the arrow S2. Y

On the other hand, when the valve member 74 is in its lower position, as shown in FIG. 2 of the drawings, the

upper end of the valve member is below the upper end of the passage means 70 leading tothe upper end of the lower cylinder 46, whereby the operating duid pressure in thevalve tubing 22 is applied, through the passage means 7i), to the upper end of the lower plunger element 42. Underl these conditions, the plunger,` 3Sy moves downwardly through its return stroke, as indicated by the arrow 84, because of the fact that the area `of thef'upper end of the lower plunger element 42fis slightly larger than the areaV of the lower end vof the upper plunger element 40'. i Y

YAs'the plunger `38 reachesthe end of its working stroke, the valve member 74` is hydraulically shifted downwardly into its lower position Vto reverse the direction of motion of the plunger, and, as the plunger reaches the end .ofV its return stroke, the valve member74 is hydraulically shifted upwardly into its upper position to once again reverse the` direction of plunger motion, allV as fully described in Patent No. 2,949,857. Therefore, a complete description herein is unnecessary.

Briey, as the plunger 355 approaches the end of its working stroke, a control groove 86 in the rod 43 bridges the lower ends of the passage means S0 and a control passage means S8, this control passage means leading upwardly through the bottom hole housing 24 and communicating at its upper end with the engine valve unit 32. Under these conditions, the lower pressure in the pump tubing 2i) is transmitted to the engine valve unit 32, by way of the passage means 88, the groove 86 and the control passage means 88, to shift the valve lmember 74 downwardly into its lower position, as fully described in Patent No. 2,949,857. This causes the plunger 38 to begin its return stroke.

As the plunger 38 approaches the end of its return stroke, a control groove 9C* in the rod 48 connects the lower end of the upper cylinder 44 to the lower end of the control passage means 88. Since the lower end of the upper cylinder 44 always contains iluid at the operating uid pressure in the valve tubing 22 by virtue of the presence of the operating iluid passage means 68, the control passage means 88 under these conditions transmits the operating uid pressure to the engine valve unit 32 to cause the valve member 74 to shift upwardly into its upper position, again as fully described in Patent No. 2,949,857. This causes the plunger 38 to begin its working stroke.

The foregoing completes the description of the structure of the lluid operating pumping system of the invention, as semidiagrammatically shown in FIGS. l and 2 ofthe drawings, and the description of the operation thereof when the engine valve unit 32 is in its operating position wherein it is seated on the annular seat 34 therefor at the upper end of the pump unit 28. The manner in which the engine valve unit 32 is hydraulically installed and removed will now be considered, still in connection with FIGS. l and 2 of the drawings.

' In order to install the engine valve unit 3 2, it is merely necessary to drop it into the upper end of the valve tubing 22 and to circulate it downwardly through the valve tubing into its operating position within the valve housing 30 by introducing operating iluid into the 'valve tubing above the engine valve unit, it being understood that the tubing system is iilled with fluid under such conditions and that such fluid is prevented from escaping into the well by the standing valves 64 and S8. It is merely neces- Y sary to introduce operating fluid into the valve tubing 22 above the engine valve unit 32 at a slight pressure to circulate the engine valve unit downwardly into its operating position, the fluid in the valve tubing beneath the engine valve unit 32 being displaced into the pump tubing 20 by way of the production tluid passage means 66.

To remove the engine valve unit 32 for service, repair, or replacement, it is merely necessary to reverse the tlow through the tubing system. In other words, fluid is introduced into the upper end of the pump tubing 20 to produce a downward ow of uid through the pump tubing, such downward flow continuing downwardly through the production iluid passage means 66 and thence upwardly into an axial passage 92 through the annular seat 34 for the engine valve unit. The upward ow into the axial passage 92 unseats the engine valve unit 32 and causes it to move upwardly out of the chamber therefor provided by the valve housing 30 and into the valve tubing 22. Continued downward ow ofviluid through the pump tubing 20 results in circulation of the engine valve unit 32 upwardly through the valve tubing 22 to the surface.

The engine valve unit 32 and the valve tubing 22 are of relatively small diameter so that a relatively small volume of fluid is required in circulating the engine valve unit into and out of the well. Consequently, the engine valve unit 32 can be removed and reinstalled, or a replacement engine valve unit can be installed, with a minimum of down time for the pumping system and with a minimum of iluid, which are important features of the invention.

As previously explained, the engine valve unit 32 is much more susceptible to wear than is the pump unit 28 so that it may be necessary to remove and replace the engine valve unit at frequent intervals, whereas it normally is necessary to remove and replace the pump unit 28 only at infrequent intervals. Thus, the ease and rapidity with which the engine valve unit 32 can be removed and replaced, without disturbing the pump unit 22, is an important feature. Of course, if service, repair or replacement of the pump unit 2S is ultimately required, it can be removed by means of the valve tubing 22'.

The present invention attains the foregoing advantages of the independently removable, separate engine valve unit 32 with the concentric system of tubings 2t) and 22, which requires a minimum amount of space in the well. Thus, the invention permits utilizing the advantages of the independently removable, separate engine valve unit 32 in slim holes, or in any other installation wherein a concentric tubing system is desired for any reason, which is an important feature.

Turning now toFIGS. 3 to 10 of the drawings, the structure of the actual physical embodiment illustrated therein will, for the most part, be clear from the foregoing description. Consequently, it will be considered only briey herein and, to avoid the application of unnecessary reference numerals to the drawings, various radial ports, annular grooves, and the like, constituting the upper and lower ends of the passage means 66, 68, 70, and S8 will be discussed without applying reference numerals thereto.

The bottom hole housing 24, which is connected at its upper end to the lower end of the pump tubing 20 in a manner not specifically shown in FIGS. 3 to 10, includes inner and outer tubes or sleeves 94 and 96 which are press fitted together and which cooperate to form the vertical portions of the various passage means 66, 68, 76, 80 and 88. More particularly, the vertical portions of these passage means are formed by external longitudinal grooves in the inner sleeve 94, the outer sides of such grooves being closed by the outer sleeve 96. As best shown in FIG. 7 of the drawings, each of the passage means 66, 68, 7 and 80 is formed by two circumferentially spaced longitudinal grooves in the inner sleeve 94, the control passage means S8 being formed by one such groove.

Considering the foregoing passage means in a little more detail, the upper ends of the longitudinal or vertical grooves forming the production fluid passage means 66 communicate with the interior of the inner sleeve 94, and thus with the interior of the pump tubing 20 thereabove, through radial ports in the inner sleeve, as will be clear from the upper end of FG. 3. Referring to the lower end of this gure, and to the upper end of FIG. 4, the lower ends of the vertical grooves forming the production fluid passage means 66 communicate through radial ports in the inner sleeve 94 and the valve housing 30 with the upper end of an annulus around an upward extension 98 of the upper end of the pump body 36. The lower end of this extension houses the standing valve 64 and the upper end thereof provides the annular seat 34 for the engine valve unit 32.

As shown a little above the middle of FIG. 3, the upper ends of the vertical grooves which form the operating fluid passage means 68 communicate through radial ports and annular grooves in the inner sleeve 94 and the valve housing 30 with an annulus around the upper end of the valve body 72, such annulus communicating with the lower end of the valve tubing 22 so that it, during normal operation, always contains operating fluid under pressure. As shown at the upper end of FIG. 4, the lower ends of the vertical grooves forming the operating fluid passage means 68 communicate through radial ports in the inner sleeve 94 with an annulus 100 between the d inner sleeve and the pump body 36, such annulus, as shown at the upper end of FIG. 5, communicating at its lower end with the lower `end of the upper cylinder` 44 through radial ports-in the'pump body.

As shown substantially at the middle of FIG. 3, the upper ends of the vertical grooves forming the passage means 7) communicate with the engine valve unit 32" their upper ends with the interior of the inner sleeve 94, andthus with theV pump tubing '23, through radial Y ports in the-inner sleeve. The branchrpassage means -78 interconnecting the passage means 8% comprises, as shown at about the middle of PIG. 3, radial ports and annular grooves in the inner sleeve 94 and in the valve housing Y 30. The vertical grooves forming the passage means 80 continue downwardlyr and, as shownatV about'the middle of FiG. 5, communicate with the bore 'for the'rod 4S through radial ports-and'annular grooves in the inner sleeve 94 and the pump body 36. The vertical groovesy forming the passage means 86 continue downwardly and, asshown'at the bottom of FIG. 5, communicate through radial ports in the inner sleeve 94 with an annulus 102` locatedV between the inner sleeve 94/and the pump body 36 and extending all the way down to the lower end of; the pump unit 28,' as will be clear from `FIG. 6. With this construction, the fluidV pressure in the pump tubingV is applied to an annular area 14atthe bottom of the pump unit ZSsubstantially .equal to an offsetting *annulary area 166, shown atithe top of lIG.V 3, at the upper end of the valve housing 30. Thus, the pump unit V2.8 is substantially hydraulicallybalanced in the'vertical-direction withrrespect to the duid pressure inthe pump tubing 2B.

It should be noted, however, that the area under the pump unit 2S whereit seats in thetapered seat 26 is exposed to well pressure through the passage 56.-v Thus the pumpY unit 2S is firmly held against the seat 26 by the downward force due to the diierencevbetween the pressure in the tubing 20 Vand that inthe inlet 56. Alsopart of the weight-or1 the tubing 22 is carriedby this-seat.

Thesingle vertical groove formingthe control passageY means 8S communicates with the enginevalveunit` 32, Y

as shown slightly below the middle of FIG. 3, through radial ports andV annulargrooves iin the inner sleeve 94` and the valve housing 30. At'its lower end, the control passagefmeans- 83, as shown above the middle ofVFIG. 5, communicates with the interior of the bore 50 for the rod. 43 through radial portsjandjannular grooves in the innerY sleeve '94 and the pumpbody `36.

Referring to FlG. 3 of thev drawings, an O-ring unit 28 and thefvalvehousing 3(3are in their operating positions, ,separatesV the upper ends of the-production iluid passage means 66 and theroperating uid passage means 168.1 Similarly, an Oring 110 separates the upper ends of the passage means 68 and 7B, an O-ringAV 112 separates the upper end of the passage means V70. andthe branch passagermeans 78, an O-ring 114 separates the branch passage Ymeans 78-and the'upper end of the control' passage means `S8, and ano-ring 116.separates the upper end of the passage means SS'from the lower end of the passage means 66.- Referring to FIG; 4 of the drawings, a similar -O-ring 118, located atthe junction of the valve housing 30 and the pump body 36, separates the lower end of the passage means` 66 from the lower end ofthe/passage means 63.

VYlos,4 Acarried bythe valve Vhousing 39' and engaging the inner sleeve 94 of thebottom-hole housing 24 when-the pump Turning to FIG. 5 of the drawings, an 0-ring 12d, carried by the pump body 36 and engaging'the inner sleeve 9d, separatesV the lower end of the operating duid passage means 68 from the lower end of the control passa e means S3. Similarly, an 0ring 122 separates the lower end of the control passage means Se from the passage means 8?.- Similar O-rings 124and 126 isolate the lower end of the passage means 70. As shown in FIG. 5, the pump body 36 includes a liner 128 through which the rod .4S extends and which'includes a vertical groove 136 communicating at its upper end with the lower end of the upper cylinder 44, and thus with the lower end of the operating duid-passage means 68. The groove communicates with the inner sides of the annular grooves containing the O-rings 120, 122 and 124` so that these O-rings are constantly biased-outwardly into engagement with the inner sleeve 94 by the operating fluid pressure.

Asshown in-FlG. 6 of the drawings, a bottom shoel32, which forms part of the bottom hole housing 2,4, is connected to thelower end of the inner sleeve 94 of thebottom hole housing. This bottom shoe provides the annular seat 2.6 for the pump unit ZSl and provides the-inlet 56 commum'cating with the well. Y

Although an exemplary embodimentY of the invention has `been disclosed herein for purposes of illustration, it will be understood that various changes, modifications and substitutions may be incorporated therein Vwithout departing from the spirit of the invention as defined bythe claims which follow. Y Y

What is claimed is:

Y l. in a iiuid operated Vpump for a well, the combination of: a-uid operated pump unit located in the well and including a pump body having therein iluid operated engine means and pump means operable by said engine means; and a separate engine valve unit located in the well in vertical'alignment withsaid pump Vunit and including'a valve body which is movable,V vertically relative to said pump body and whichhas therein movable engine vmve means for controlling the'roperationfof said engine means.

2. In a iluidoperatedpump forvavwell, the combination of: -a fluid operated pump unit locatedrin the well and including a pump body having therein reciprocable, nterconnected engine and pump piston means, saidrengine and pumppistonmeans being axially reciprocable in said pump body by an alternating iluid pressure dierenu'al applied to said engine piston means; anda separate engine valveeunit located in the well in axial-alignment with said engine and pump piston means and including arvalve Vbody which'is movable vertically relativeto said pump body and which has thereinY movable engine valve means for applying an alternating huid pressure dilierential to said engine piston means so asA to axially reciprocate said cnginevand pump pist-on means.

Y3. ln a liuid operated pump fora well, the combination of: a. fluid operated pump unit located in thewell and including a pumpbody having therein reciprocablainterconnected engine and pump piston means, said engine and pump piston means being axially reciprocable in said pump body byY an alternating fluid pressure'dilierential applied tosaid engine` piston means; and. a. separate.

engine valve unit located in a well above and in axial alignment with said engine and pump piston means and including a valve-body which is'movable vertically relativeY to said pump body andwhichhas therein movable enginevalvemeans for appl-ying aualternating iluid pressure difterentialto-said engine piston means so as to axially reciprocate said engine *andY pump piston means.

Y4. ln a iluid operated pumping system, the combination of: a lluidfoperated pumpunitdisposed inawell and including'a'pump-body havingtherein reciprocable, interconnected engineY and pump piston means; a separate uid yoperated-valve.unit-disposed.in the well above and in alignment with said pump unit,said'valve unit including-a valve body which smovable vertically relative to said pump body and which has therein movable engine valve means for `applying an alternating uid pressure differential to said engine piston means to reciprocate said engine and pump piston means; means, including a supply tubing set in the well, for conveying operating fluid under pressure downwardly to said units; and means for conveying production liuid discharged by said pump piston means and spent operating tluid upwardly from said units.

5. In a fluid operated pumping system, the combination of: concentric pump and valve tubings set in a well with said valve tubing within said pump tubing; a fluid operated pump unit in the well in alignment with said pump and valve tubings and below said valve tubing, said pump unit including a pump body having therein movable interconnected engine and pump piston means; and a liuid operated valve unit movable through said valve tubing into an operating position in the well above and in axial alignment with said pump unit, said valve unit including a valve body having therein movable engine valve means for applying an alternating uid pressure diierential to said engine piston means to reciprocate said engine and pump piston means.

6. In a tluid operated pumping system, the combination of: concentric pump and valve tubings set in a well with said valve tubing within said pump tubing; a bottom hole housing connected to the lower end of said pump tubing; a fluid operated pump unit in said bottom hole housing below and connected to the lower end of said valve tubing, said pump unit including a pump body having therein movable interconnected engine and pump piston means; a fluid operated valve unit movable through said valve tubing into an operating position in the Well above and in axial alignment with said pump unit, said valve unit including a valve body having therein movable engine valve means for applying an alternating uid pressure dierential to said engine piston means to reciprocate said engine and pump piston means; and means for moving said valve unit from its operating position in the well upwardly through said valve tubing to the surface.

7. In a uid operated pumping system, the combination of: concentric pump and valve tubings set in a well with said valve tubing within said pump tubing; a bottom hole housing connected to the lower end of said pump tubing; a fluid operated pump unit in said bottom hole housing below and connected to the lower end of said valve tubing, said pump unit including a pump body having therein movable interconnected engine and pump piston means; a fluid operated valve unit movable through said valve tubing into an operating position in the well above and in axial alignment with said pump unit, said valve unit including a valve body having therein movable engine valve means for applying an alternating fluid pressure differential to said engine piston means to reciprocate said engine and pump piston means; and means for hydraulically moving said valve unit from its operating position in the well upwardly through said valve tubing to the surface.

8. In a duid operated pumping system, the combination of: a bottom hole assembly set in a well and providing an upwardly facing valve chamber; a valve tubing set in the well and commuincating at its lower end with said valve chamber; a uid operated pump unit forming part of said bottom hole assembly and located below and in alignment with said valve chamber, said pump unit including a pump body having therein movable interconnected engine and pump piston means; and a fluid operated valve unit separate from said pump unit and movable between the surface and said valve chamber through said valve tubing, said valve unit including a Valve body having therein movable engine valve means for applying an alternating fluid pressure diierential to said engine piston means to reciprocate said engine and pump piston means.

9. In a iluid operated pump for a well, the combination of: a pump unit located in the well and including a pump 1Jody having therein movableinterconnected engine and pump piston means having an axial passage therethrough for the upward flow of uid pumped by said pump piston means; a separate engine valve unit located in the well above and in axial alignment with said pump unit and including engine valve means for applying an alternating iluid pressure differential to said engine piston means to reciprocate said engine and pump piston means, said valve unit including a valve body in which said engine valve means is disposed and which is movable vertically relative to said pump body; and bypass passage means for the upward iiow of fluid pumped by said pump piston means communicating with the upper end of said axial passage and located alongside said valve unit.

10. In a fluid operated pumping system for a well, the combination of: a iiuid operated pump unit located in the well. and including a pump body having therein movable fluid operated engine means and pump means operable by said engine means; a valve housing above and in axial alignment with and connected to the upper end of said pump body; a valve tubing above and in axial alignment with and connected at its lower end to said valve housing; and a fluid operated valve unit movable downwardly through said valve tubing into said valve housing and including a Valve body having therein engine valve means for controlling the operation of said engine means when said valve unit is in said valve housing.

l1. in a fluid operated pumping system for a well, the combination of: a bottom hole housing in the well; a iiuid operated pump unit in said bottom hole housing and including a pump body having therein movable fluid operated engine means and pump means operable by said engine means; a valve housing in said bottom hole housing above and in axial alignment with and connected to the upper end of said pump body; a valve tubing above and in axial alignment with and connected at its lower end to said valve housing; a fluid operated valve unit movable downwardly through said valve tubing into said valve housing and including a valve body having therein engine valve means for controlling the operation of said engine means when said valve unit is in said valve housing; passage means in said bottom hole housing and interconnecting said engine means and said engine valve means when said valve unit is in said valve housing; and a pump tubing encircling said valve tubing and connected at its lower end to the upper end of said bottom hole housing.

References Cited in the tile of this patent UNITED STATES PATENTS Re. 24,812 Deitrickson Apr. 19, 1960 1,577,971 Humphreys Mar. 23, 1926 2,046,588 Sproull July 7, 1936 2,053,602 Coberly Sept. 8, 1936 2,589,668 Coberly Mar. 18, 1952 

